Oil Field Surface Expressions

​​​​​Under strengthened regulations effective ‪April 1, 2019, surface expressions violate state regulations enforced by the Geologic Energy Management Division (CalGEM). A surface expression can occur when steam injected under pressure to produce oil breaks through natural geologic barriers and comes to the surface. The releases in the Cymric, Midway Sunset, and McKittrick oil fields in Kern County are not near population centers or sources of drinking water. All of the expressions are contained and are clustered in a few areas. CalGEM is collaborating with independent experts from the Lawrence Livermore and Sandia National Laboratories to investigate the expressions in the Cymric field.

Refer to the California Office of Emergency Services (CalOES) Spill Report  for additional information on active surface expressions, including volumes of oil and water released.  

Use "Search" to enter the incident number, for example, 19-7291 (numbers available below), for reports. ​​

Note: Page updated June 2022